Conical coil spring



FIG. 1 is a front perspective view of a conical coil spring showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is an inverted plan view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a left side elevational view thereof; and,

FIG. 7 is a right side view thereof. 

The ornamental design for conical coil spring, as shown and described. 